CN112357879B - Method for electrochemical hydrogenation of organic liquid hydrogen storage material - Google Patents

Method for electrochemical hydrogenation of organic liquid hydrogen storage material Download PDF

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CN112357879B
CN112357879B CN202011291926.2A CN202011291926A CN112357879B CN 112357879 B CN112357879 B CN 112357879B CN 202011291926 A CN202011291926 A CN 202011291926A CN 112357879 B CN112357879 B CN 112357879B
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electrolyte
hydrogen storage
storage material
organic liquid
proper amount
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CN112357879A (en
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李寒煜
郑欣
邱方程
刘荣海
李宗红
杨雪滢
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
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    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/0005Reversible uptake of hydrogen by an appropriate medium, i.e. based on physical or chemical sorption phenomena or on reversible chemical reactions, e.g. for hydrogen storage purposes ; Reversible gettering of hydrogen; Reversible uptake of hydrogen by electrodes
    • C01B3/001Reversible uptake of hydrogen by an appropriate medium, i.e. based on physical or chemical sorption phenomena or on reversible chemical reactions, e.g. for hydrogen storage purposes ; Reversible gettering of hydrogen; Reversible uptake of hydrogen by electrodes characterised by the uptaking medium; Treatment thereof
    • C01B3/0015Organic compounds; Solutions thereof
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    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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    • C25B1/01Products
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    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/32Hydrogen storage

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Abstract

The invention discloses a method for electrochemically hydrogenating an organic liquid hydrogen storage material, which comprises the steps of adding electrolyte and a catalyst into the organic liquid hydrogen storage material, and adding a proton donor to enable a solvent in the electrolyte to provide protons under electric drive, so that the electrochemical hydrogenation of the organic hydrogen storage material is realized, the method is simple, the cost is low, and hydrogen storage under the conditions of no hydrogen source and mild condition can be realized.

Description

Method for electrochemical hydrogenation of organic liquid hydrogen storage material
Technical Field
The invention belongs to the field of liquid hydrogen storage, and particularly relates to a method for electrochemical hydrogenation of an organic liquid hydrogen storage material.
Background
With the development of society and the improvement of human environmental protection consciousness, the global energy utilization gradually develops from fossil energy to new energy, and light energy, wind energy and hydrogen energy in the new energy are important development directions, wherein the hydrogen energy is not only a green and efficient energy, but also takes water as a product after combustion, and the water can prepare hydrogen again through electrolysis, so that the green circulation of the hydrogen energy is realized. However, hydrogen is the lightest element on earth, and the density of hydrogen is very low in both gas and liquid states, and the hydrogen energy is used as a fuel, so that the problems of storage and transportation are needed to be solved. In the development process of the hydrogen energy technology, how to store hydrogen with high density and safety is a key to the actual trend of the hydrogen energy technology.
It is found that to realize large-scale storage and utilization of hydrogen energy, the hydrogen storage system needs to have the following characteristics: high hydrogen storage density, flexible and convenient use requirement, and safe and reliable hydrogen storage mode. The hydrogen storage technology commonly used at present comprises high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage, metal hydride hydrogen storage, metal organic framework compound hydrogen storage, organic liquid hydrogen storage and the like. The organic liquid hydrogen storage material is an effective means for realizing large-scale hydrogen storage and long-distance transportation of hydrogen because of a safe and efficient hydrogen storage mode. Compared with the traditional hydrogen storage method, the organic liquid has high hydrogen storage quantity and hydrogen storage density, good reversibility, recyclable reactants and products, similar to gasoline in property, and can be transported and stored by imitating the existing infrastructure of pipelines, gas stations and the like.
While the present method for storing hydrogen in organic liquid generally adopts a thermocatalytic hydrogen storage mode, the traditional thermocatalytic hydrogen adding method requires that hydrogen is deposited on a substrate with larger surface area (such as alumina, silica or zeolite) and is catalyzed and decomposed by active metals on the substrate such as palladium, platinum, rhodium, ruthenium or Raney nickel, and the like, the reaction conditions are generally severe (the pressure is up to 500atm and the temperature is up to 200 ℃, so that the problems such as expensive reactor design, easiness in thermal decomposition or isomerization of organic substrates at high temperature and the like are caused. In addition, conventional thermocatalytic hydrogenation requires the provision of hydrogen as a hydrogen source, which presents a safety hazard.
Disclosure of Invention
The invention aims to solve the problem of solubility of an organic liquid hydrogen storage material, and simultaneously improves the conductivity of electrolyte and provides a hydrogen source through an auxiliary agent, improves the reaction activity, reduces the reaction temperature and the reaction pressure, realizes the electrochemical hydrogenation of the hydrogen storage material, and provides a method for electrochemically hydrogenating the organic liquid hydrogen storage material.
The invention adopts the following technical scheme: the method for electrochemically hydrogenating the organic liquid hydrogen storage material is characterized by comprising the following steps: electrolyte and catalyst are added into the organic liquid hydrogen storage material, and an proton donor is added to enable a solvent in the electrolyte to provide protons under electric drive, so that electrochemical hydrogenation of the organic hydrogen storage material is realized.
Preferably, the catalyst adopts carbon-supported platinum nano particles and ruthenium dioxide.
Preferably, the electrolyte is a mixed solution of acetonitrile or N, N-dimethylformamide, a proton donor and tetrabutylammonium bromide, and a certain amount of cosolvent is added.
Preferably, the cosolvent adopts methanol or ethanol, and the proton donor adopts deionized water.
Preferably, the preparation of the electrolyte comprises the following steps:
s1, taking a proper amount of acetonitrile or N, N-dimethylformamide as a solvent, adding a proper amount of methanol or ethanol into the solvent as a cosolvent, and then fully stirring to form a mixed solution;
s2, adding a proper amount of deionized water into the mixed solution to keep the molar concentration of the deionized water at 0.5mol/L to 5mol/L;
s3, adding a proper amount of tetrabutylammonium bromide, keeping the molar concentration of the tetrabutylammonium bromide between 0.5mol/L and 5mol/L, and magnetically stirring for 30min to obtain the electrolyte.
As a preferred embodiment, a method for electrochemical hydrogenation of an organic liquid hydrogen storage material comprises the steps of:
the first step: respectively adding a proper amount of electrolyte into an anode chamber and a cathode chamber of the H-type electrolytic cell, and separating the anode chamber and the cathode chamber by adopting a sand core glass partition plate;
and a second step of: adding a proper amount of organic matters such as quinoline, ethyl carbazole, propyl carbazole or indole into a cathode chamber, and fully stirring until the organic matters are completely dissolved;
and a third step of: ultrasonically stirring a proper amount of platinum carbon, ethanol and a nafion membrane solution with a film forming agent of 50 mu L for 30min to obtain a platinum carbon catalyst, and smearing the prepared catalyst on a glassy carbon electrode for multiple times by using a pipetting gun for natural drying;
fourth step: inserting a glassy carbon electrode coated with a catalyst into a cathode chamber electrolyte, inserting a platinum wire into an anode chamber electrolyte, and inserting a saturated calomel electrode into a reference electrode chamber electrolyte;
fifth step: performing linear voltammetry on the electrolyte by adopting a linear voltammetry scanning method, setting the potential to be 0 to-3.5V, performing scanning test at a speed of 100mV/s from positive to negative, and recording a voltammetry scanning curve;
sixth step: judging the potential of hydrogenation reaction from the voltammetric scanning curve, carrying out constant potential electrolysis at the potential, taking out cathode chamber electrolyte after a certain time, carrying out GC-MS test, and analyzing and testing the hydrogen content of the electrolysis product.
The beneficial effects are that: the invention provides a mixed electrolyte reaction system, which enables an organic liquid hydrogen storage material to realize electrochemical hydrogenation under the system. The innovation point of the method is that electrochemical hydrogenation is adopted for the organic liquid hydrogen storage material, so that hydrogen storage under the conditions of no hydrogen source and milder temperature is realized.
Drawings
FIG. 1 is a graph of electrochemical hydrogenation polarization of ethylcarbazole in the examples;
FIG. 2 is a graph of gc-ms analysis of the hydrogenated product of ethylcarbazole in the example.
Detailed Description
The invention is described in further detail below with reference to examples and figures:
examples: a method for electrochemically hydrogenating an organic liquid hydrogen storage material is characterized by comprising the following steps: electrolyte and catalyst are added into the organic liquid hydrogen storage material, and a proton donor is added to enable a solvent in the electrolyte to provide protons under electric drive, so that electrochemical hydrogenation of the organic hydrogen storage material is realized.
In the concrete implementation, the catalyst adopts carbon-supported platinum nano particles and ruthenium dioxide; the solution adopts a mixed solution comprising acetonitrile or N, N-dimethylformamide, a proton donor and tetrabutylammonium bromide, and a certain amount of cosolvent is added; the cosolvent adopts methanol or ethanol, and the proton donor adopts deionized water.
Wherein the preparation of the electrolyte comprises the following steps:
s1, taking a proper amount of acetonitrile or N, N-dimethylformamide as a solvent, adding a proper amount of methanol or ethanol into the solvent as a cosolvent, and then fully stirring to form a mixed solution;
s2, adding a proper amount of deionized water into the mixed solution to keep the molar concentration of the deionized water at 0.5mol/L to 5mol/L;
s3, adding a proper amount of tetrabutylammonium bromide, keeping the molar concentration of the tetrabutylammonium bromide between 0.5mol/L and 5mol/L, and magnetically stirring for 30min to obtain the electrolyte.
The specific implementation steps of the method are as follows:
the first step: respectively adding a proper amount of electrolyte into an anode chamber and a cathode chamber of the H-type electrolytic cell, and separating the anode chamber and the cathode chamber by adopting a sand core glass partition plate;
and a second step of: adding a proper amount of organic matters such as quinoline, ethyl carbazole, propyl carbazole or indole into a cathode chamber, and fully stirring until the organic matters are completely dissolved;
and a third step of: ultrasonically stirring a proper amount of platinum carbon, ethanol and a nafion membrane solution with a film forming agent of 50 mu L for 30min to obtain a platinum carbon catalyst, and smearing the prepared catalyst on a glassy carbon electrode for multiple times by using a pipetting gun for natural drying;
fourth step: inserting a glassy carbon electrode coated with a catalyst into a cathode chamber electrolyte, inserting a platinum wire into an anode chamber electrolyte, and inserting a saturated calomel electrode into a reference electrode chamber electrolyte;
fifth step: as shown in fig. 1, the electrolyte is subjected to linear voltammetry test by adopting a linear voltammetry scanning method, the potential is set to be 0 to-3.5V, the scanning test is carried out at the speed of 100mV/s from positive to negative, and a lower voltammetry scanning curve is recorded;
sixth step: judging the potential of hydrogenation reaction from the voltammetric scanning curve, carrying out constant potential electrolysis at the potential, taking out cathode chamber electrolyte after a certain time, carrying out GC-MS test, and verifying the electrochemical hydrogenation effect according to the test result, wherein the result is shown in the attached figure 2.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (3)

1. A method for electrochemically hydrogenating an organic liquid hydrogen storage material, characterized by: electrolyte and a catalyst are added into the organic liquid hydrogen storage material, and a proton donor is added to enable a solvent in the electrolyte to provide protons under electric drive, so that electrochemical hydrogenation of the organic hydrogen storage material is realized;
the organic liquid hydrogen storage material is quinoline, ethyl carbazole, propyl carbazole or indole;
the catalyst adopts carbon-supported platinum nano particles or ruthenium dioxide;
the electrolyte adopts a mixed solution comprising acetonitrile or N, N-dimethylformamide, a proton donor and tetrabutylammonium bromide, and a certain amount of cosolvent is added;
the cosolvent adopts methanol or ethanol, and the proton donor adopts deionized water.
2. The method for electrochemical hydrogenation of an organic liquid hydrogen storage material according to claim 1, wherein said electrolyte is prepared by the steps of:
s1, taking a proper amount of acetonitrile or N, N-dimethylformamide as a solvent, adding a proper amount of methanol or ethanol into the solvent as a cosolvent, and then fully stirring to form a mixed solution;
s2, adding a proper amount of deionized water into the mixed solution to keep the molar concentration of the deionized water at 0.5mol/L to 5mol/L;
s3, adding a proper amount of tetrabutylammonium bromide, keeping the molar concentration of the tetrabutylammonium bromide between 0.5mol/L and 5mol/L, and magnetically stirring for 30min to obtain the electrolyte.
3. A method of electrochemically hydrogenating an organic liquid hydrogen storage material in accordance with claim 1, comprising the steps of:
the first step: respectively adding a proper amount of electrolyte into an anode chamber and a cathode chamber of the H-type electrolytic cell, and separating the anode chamber and the cathode chamber by adopting a sand core glass partition plate;
and a second step of: adding a proper amount of quinoline, ethyl carbazole, propyl carbazole or indole organic matters into the cathode chamber, and fully stirring until the organic matters are completely dissolved;
and a third step of: stirring a proper amount of platinum carbon, ethanol and a nafion membrane solution with a film forming agent of 50 mu L for 30min by ultrasonic waves to obtain a platinum carbon catalyst, and smearing the prepared catalyst on a glassy carbon electrode for multiple times by using a pipetting gun for natural drying;
fourth step: inserting a glassy carbon electrode coated with a catalyst into the cathode chamber electrolyte, inserting a platinum wire into the anode chamber electrolyte, and inserting a saturated calomel electrode into the reference electrode chamber electrolyte;
fifth step: carrying out linear voltammetry on the electrolyte by adopting a linear voltammetry scanning method, setting the potential to be 0 to-3.5V, carrying out scanning test at a speed of 100mV/s from positive to negative, and recording a voltammetry scanning curve;
sixth step: judging the potential of hydrogenation reaction from the voltammetric scanning curve, carrying out constant potential electrolysis at the potential, taking out cathode chamber electrolyte after a certain time, carrying out GC-MS test, and analyzing and testing the hydrogen content of the electrolysis product.
CN202011291926.2A 2020-11-18 2020-11-18 Method for electrochemical hydrogenation of organic liquid hydrogen storage material Active CN112357879B (en)

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CN101224421A (en) * 2007-01-18 2008-07-23 比亚迪股份有限公司 Preparing method of carbon supported platinum-transition metal macrocyclic compound catalyst
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CN101224421A (en) * 2007-01-18 2008-07-23 比亚迪股份有限公司 Preparing method of carbon supported platinum-transition metal macrocyclic compound catalyst
CN106148990A (en) * 2015-04-15 2016-11-23 高·哈里·凡 Electrochemistry high-pressure hydrogenation and organic liquid hydrogen-storing device and hydrogen storage method
CN108505064A (en) * 2018-04-17 2018-09-07 昆明理工大学 A kind of platinum base membrane electrode catalysis unsaturated compounds add the method for hydrogen
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